The Xpress XP18 2011 is a modified-V design and the Xpress Yukon 18 2009 is a deep-V design, so you're likely deciding between two noticeably different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.
On paper these two are close siblings in the size department - Xpress XP18 2011 at 18,0 ft versus Xpress Yukon 18 2009 at 18,0 ft. Weight tells a clearer story for trailering families: the Xpress Yukon 18 2009 tips the scales at 1 215 lbs - 170 lbs less than the Xpress XP18 2011 at 1 045 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
The power gap is worth calling out. Rated to 115 hp, the Xpress Yukon 18 2009 has a 25-hp advantage over the Xpress XP18 2011's 90-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
For family outings this is probably the sharpest distinction between the two. The Xpress Yukon 18 2009 is rated for 5 passengers, while the Xpress XP18 2011 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Xpress Yukon 18 2009 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Xpress Yukon 18 2009 comes in at 11 lbs per hp versus 12 lbs per hp for the Xpress XP18 2011. The lower the ratio the more explosive the acceleration - meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.
Bottom line: Choose the Xpress Yukon 18 2009 if your priority is putting more people on the water - it handles 5 passengers and at 18,0 ft it has the deck room to back that rating up comfortably. The Xpress XP18 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.